A look at the state of vaccine passport apps, which have raised concerns over privacy and verification accuracy, as cities like NYC mandate proof of vaccination (Cyrus Farivar/NBC News)

Cyrus Farivar / NBC News:
A look at the state of vaccine passport apps, which have raised concerns over privacy and verification accuracy, as cities like NYC mandate proof of vaccination  —  As New York becomes the first major U.S. city to mandate proof of vaccination against Covid-19 for indoor activities …